ceph/src/boost/libs/thread/test/sync/mutual_exclusion/null_mutex/try_lock_for_pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 // Copyright (C) 2011 Vicente J. Botet Escriba
  11 //
  12 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
  13 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  14
  15 // <boost/thread/null_mutex.hpp>
  16
  17 // class null_mutex;
  18
  19 // template <class Rep, class Period>
  20 //     bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
  21
  22 #include <boost/thread/null_mutex.hpp>
  23 #include <boost/thread/thread.hpp>
  24 #include <boost/detail/lightweight_test.hpp>
  25
  26 #if defined BOOST_THREAD_USES_CHRONO
  27
  28
  29 boost::null_mutex m;
  30
  31 typedef boost::chrono::steady_clock Clock;
  32 typedef Clock::time_point time_point;
  33 typedef Clock::duration duration;
  34 typedef boost::chrono::milliseconds ms;
  35 typedef boost::chrono::nanoseconds ns;
  36
  37 void f1()
  38 {
  39   time_point t0 = Clock::now();
  40   // This test is spurious as it depends on the time the thread system switches the threads
  41   BOOST_TEST(m.try_lock_for(ms(100)) == true);
  42   time_point t1 = Clock::now();
  43   BOOST_TEST(m.try_lock());
  44   m.unlock();
  45   m.unlock();
  46   ns d = t1 - t0 ;
  47   // This test is spurious as it depends on the time the thread system switches the threads
  48   BOOST_TEST(d < ns(5000000)); // within 5ms
  49 }
  50
  51
  52 int main()
  53 {
  54   {
  55     m.lock();
  56     boost::thread t(f1);
  57     m.unlock();
  58     t.join();
  59   }
  60
  61   return boost::report_errors();
  62 }
  63
  64 #else
  65 #error "Test not applicable: BOOST_THREAD_USES_CHRONO not defined for this platform as not supported"
  66 #endif
  67